Negotiation is widely used in agent-based e-business applications. Traditional predefined negotiation approaches cannot fully solve the negotiation automation problem due to their inadequate compatibility and limited adaptability, especially in open dynamic environments. This paper proposes an adaptive negotiation framework by enhancing the adaptability of the negotiation framework and participating agents. It includes a set of meta-components that can be used by negotiation participants to dynamically compose a suitable negotiation mechanism according to its negotiation context so as to increase the negotiation efficiency and system performance. The proposed framework has been designed, implemented and validated through a prototype system.